Hi Bartosh, I've attached here a reconstructed version of your object which has the pieces aligned, it should now behave better when you do the boolean difference, the cutting object will leave its "imprint" into the base object sealing up that hole area automatically.

I rebuilt this by extracting the edge curves from the flat face, tuning up the control point alignment that I mentioned above so it was smooth on that upper part, then extuding that, then using the edge of the extrusion to do a 180 degree revolve, then boolean union of those 2 pieces and also with the bottom knob which I had also extracted out.

Somehow during your construction you ended up with a slightly different profile shape for building the revolve portion versus the extrude portion... Make sure when you're picking things like revolve axes that you have snaps turned on including "Straight snap" so that you can easily get exactly vertical and horizontal lines.

- Michael

Hi bartosh, one other quick note - when your cutting object is only curved in one direction and straight in the other direction you can just leave it as a 2D curve instead of building it out into a surface and use the 2D curve as the cutting object in the boolean operation.

The booleans will automatically extrude out 2D cutting curves inside their own calculations, that can save some steps.

You only really need to build a full cutting surface if your cutting surface is more complex like if it curves in multiple directions and needs to be created by a sweep or something like that.

- Michael

That's a really interesting model. I had to try it with metal flake paint for fun. Click image to enlarge.

Ed

Thanks a lot once again. You are very kind for freshman ;)

Now I can see that my first work in Moi was messy, I need to do it more tidy next time whithout errors.

Is there any easy way to fix alignment of edges or it should be re-make from beginning?

Hi Bartosh - in a case like this it's kind of easier to remake it from the beginning, but I've actually done that for you already above - the remade version is the file attached to this message here:

http://moi3d.com/forum/index.php?webtag=MOI&msg=5811.12

- Michael